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We study experimentally and theoretically the dynamics of apparent darksoliton stripes in an elongated Bose-Einstein condensate. We show that for thetrapping strengths corresponding to our experimental setup, the transverseconfinement along one of the tight directions is not strong enough to arrestthe formation of solitonic vortices or vortex rings. These solitonic vorticesand vortex rings, when integrated along the transverse direction, appear asdark soliton stripes along the longitudinal direction thereby hiding their truecharacter. The latter significantly modifies the interaction dynamics duringcollision events and can lead to apparent examples of inelasticity and what mayappear experimentally even as a merger of two dark soliton stripes. We explainthis feature by means of the interaction of two solitonic vortices leading to asling shot event with one of the solitonic vortices being ejected at arelatively large speed. Furthermore we observe expanding collision bubbleswhich consist of repeated inelastic collisions of a dark soliton stripe pairwith an {\it increasing} time interval between collisions.

Inelastic Collisions of Solitary Waves in Anisotropic Bose-Einstein Condensates: Sling-Shot Events and Expanding Collision Bubbles